With the e-Studio 20, you will need to go through your 'Add Printer Wizard'.
1. When asked, select 'Local Printer'
2. Create New Port
3. Standard TCP/IP Port
4. Type in the IP Address of the machine when asked and don't change the port name.
5. Leave the NIC type as generic and change the settings so that the RAW Port number is '10001' - This is the standard port number. Print a NIC Config Page to determine your 'Base Port Number'.
6. Continue through the wizard as normal selecting your driver that you have downloaded. Make sure you also have the driver from the region that you bought the machine from (ie.
www.eid.toshiba.com.au for Australia).
As for the Username and Password, if this is through the Web interface, then it is 'Admin' for the username and 'sysadm' for the password. Haven't seen them ask for a username though, usually this is pre-input.
As for the e-Studio 3511, please check your original thread for your answer as someone had replied.